text: /**
    ******************************************************************************
    * @file    stm32l4xx_hal_spi_ex.c
    * @author  MCD Application Team
    * @version V1.0.0
    * @date    26-June-2015
    * @brief   Extended SPI HAL module driver.
    *          This file provides firmware functions to manage the following
    *          SPI peripheral extended functionalities :
    *           + IO operation functions
    *
    ******************************************************************************
    * @attention
    *
    * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
    *
    * Redistribution and use in source and binary forms, with or without modification,
    * are permitted provided that the following conditions are met:
    *   1. Redistributions of source code must retain the above copyright notice,
    *      this list of conditions and the following disclaimer.
    *   2. Redistributions in binary form must reproduce the above copyright notice,
    *      this list of conditions and the following disclaimer in the documentation
    *      and/or other materials provided with the distribution.
    *   3. Neither the name of STMicroelectronics nor the names of its contributors
    *      may be used to endorse or promote products derived from this software
    *      without specific prior written permission.
    *
    * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
    * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
    * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    *
    ******************************************************************************
    */
  
  /* Includes ------------------------------------------------------------------*/
  #include "stm32l4xx_hal.h"
  
  /** @addtogroup STM32L4xx_HAL_Driver
    * @{
    */
  
  /** @defgroup SPIEx SPIEx
    * @brief SPI Extended HAL module driver
    * @{
    */
  #ifdef HAL_SPI_MODULE_ENABLED
  
  /* Private typedef -----------------------------------------------------------*/
  /* Private defines -----------------------------------------------------------*/
  /** @defgroup SPIEx_Private_Constants SPIEx Private Constants
    * @{
    */
  #define SPI_FIFO_SIZE       4
  /**
    * @}
    */
  
  /* Private macros ------------------------------------------------------------*/
  /* Private variables ---------------------------------------------------------*/
  /* Private function prototypes -----------------------------------------------*/
  /* Exported functions ---------------------------------------------------------*/
  
  /** @defgroup SPIEx_Exported_Functions SPIEx Exported Functions
    * @{
    */
  
  /** @defgroup SPIEx_Exported_Functions_Group1 IO operation functions
   *  @brief   Data transfers functions
   *
  @verbatim
    ==============================================================================
                        ##### IO operation functions #####
   ===============================================================================
   [..]
      This subsection provides a set of extended functions to manage the SPI
      data transfers.
  
      (#) Rx data flush function:
          (++) HAL_SPIEx_FlushRxFifo()
  
  @endverbatim
    * @{
    */
  
  /**
    * @brief Flush the RX fifo.
    * @param  hspi: pointer to a SPI_HandleTypeDef structure that contains
    *               the configuration information for the specified SPI module.
    * @retval HAL status
    */
  HAL_StatusTypeDef HAL_SPIEx_FlushRxFifo(SPI_HandleTypeDef *hspi)
  {
    __IO uint32_t tmpreg;
    uint8_t  count = 0;
    while((hspi->Instance->SR & SPI_FLAG_FRLVL) !=  SPI_FRLVL_EMPTY)
    {
      count++;
      tmpreg = hspi->Instance->DR;
      UNUSED(tmpreg); /* To avoid GCC warning */
      if(count == SPI_FIFO_SIZE)
      {
        return HAL_TIMEOUT;
      }
    }
    return HAL_OK;
  }
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  #endif /* HAL_SPI_MODULE_ENABLED */
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  